gpu: nvgpu: gp10b: set floor emc freq to bwmgr

Set emc floor frequency as zero during rail-gate and set max emc
frequency as floor frequency during rail-ungate.

Bug 1770241

Change-Id: Ib6b6ea6c8b04518423126c3ca3600b4afac15180
Signed-off-by: Seshendra Gadagottu <sgadagottu@nvidia.com>
Reviewed-on: http://git-master/r/1152848
Reviewed-by: Automatic_Commit_Validation_User
GVS: Gerrit_Virtual_Submit
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 15 insertions, 1 deletions

diff --git a/drivers/gpu/nvgpu/gp10b/platform_gp10b_tegra.c b/drivers/gpu/nvgpu/gp10b/platform_gp10b_tegra.c
index 68179685..d3ccd98e 100644
--- a/drivers/gpu/nvgpu/gp10b/platform_gp10b_tegra.c
+++ b/drivers/gpu/nvgpu/gp10b/platform_gp10b_tegra.c
@@ -220,6 +220,13 @@ static bool gp10b_tegra_is_railgated(struct device *dev)
 static int gp10b_tegra_railgate(struct device *dev)
 {
         struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct gk20a_scale_profile *profile = platform->g->scale_profile;
+
+        /* remove emc frequency floor */
+        if (profile)
+                tegra_bwmgr_set_emc(
+                        (struct tegra_bwmgr_client *)profile->private_data,
+                        0, TEGRA_BWMGR_SET_EMC_FLOOR);
 
         if (tegra_bpmp_running() &&
             tegra_powergate_is_powered(TEGRA_POWERGATE_GPU)) {
@@ -237,6 +244,7 @@ static int gp10b_tegra_unrailgate(struct device *dev)
 {
         int ret = 0;
         struct gk20a_platform *platform = gk20a_get_platform(dev);
+        struct gk20a_scale_profile *profile = platform->g->scale_profile;
 
         if (tegra_bpmp_running()) {
                 int i;
@@ -246,6 +254,13 @@ static int gp10b_tegra_unrailgate(struct device *dev)
                                 clk_prepare_enable(platform->clk[i]);
                 }
         }
+
+        /* to start with set emc frequency floor to max rate*/
+        if (profile)
+                tegra_bwmgr_set_emc(
+                        (struct tegra_bwmgr_client *)profile->private_data,
+                        tegra_bwmgr_get_max_emc_rate(),
+                        TEGRA_BWMGR_SET_EMC_FLOOR);
         return ret;
 }
 
@@ -407,7 +422,6 @@ struct gk20a_platform t18x_gpu_tegra_platform = {
         /* frequency scaling configuration */
         .prescale = gp10b_tegra_prescale,
         .postscale = gp10b_tegra_postscale,
-
         .devfreq_governor = "nvhost_podgov",
         .qos_id = PM_QOS_GPU_FREQ_MIN,